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Long-Term Incentive Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Equity-Classified Stock-Based Compensation Costs
The Company recorded the following costs related to long-term incentive compensation for the years ended December 31, 2021, 2020 and 2019:
(in millions)202120202019
Long-term incentive compensation – expensed$30 $17 $17 
Long-term incentive compensation – capitalized18 7 10 
The Company recorded the following compensation costs related to equity-classified stock options for the years ended December 31, 2021, 2020 and 2019:
(in millions)202120202019
Stock options – general and administrative expense$— $— $1 
Stock options – capitalized expense$— $— $— 
The Company recorded the following compensation costs related to equity-classified restricted stock grants for the years ended December 31, 2021, 2020 and 2019:
(in millions)202120202019
Restricted stock grants – general and administrative expense$2 $3 $6 
Restricted stock grants – capitalized expense$— $1 $4 
(in millions)202120202019
Performance units – general and administrative expense$— $— $1 
Performance units – capitalized expense$— $— $— 
The Company recorded the following compensation costs related to performance cash awards for the years ended December 31, 2021 and 2020:
(in millions)20212020
Performance cash awards – general and administrative expense$4 $2 
Performance cash awards – capitalized expense$4 $2 
Summary of Equity-Classified Stock Option Activity
The following tables summarize stock option activity for the years 2021, 2020 and 2019, and provide information for options outstanding at December 31 of each year:
202120202019
Number
of Shares		Weighted Average Exercise Price
Number
of Shares
Weighted Average Exercise Price
Number
of Shares
Weighted Average Exercise Price
(in thousands) (in thousands) (in thousands) 
Options outstanding at January 13,850 $13.39 4,635 $15.26 5,178 $17.06 
Granted— $— — $— — $— 
Exercised— $— — $— — $— 
Forfeited or expired(844)$29.10 (785)$24.46 (543)$32.38 
Options outstanding at December 313,006 $8.98 3,850 $13.39 4,635 $15.26 
Summary of Stock Options Outstanding and Options Exercisable
Options OutstandingOptions Exercisable
Range of
Exercise Prices
Options Outstanding at December 31, 2021Weighted Average Exercise PriceWeighted Average Remaining Contractual LifeOptions Exercisable at December 31, 2021Weighted Average Exercise PriceWeighted Average Remaining Contractual Life
(in thousands) (years)(in thousands) (years)
$7.74-$29.42
3,006 $8.98 1.33,006 $8.98 1.3
Summary of Equity-Classified Restricted Stock Activity
The following table summarizes the restricted stock activity for the years 2021, 2020 and 2019, and provides information for restricted stock outstanding at December 31 of each year:
202120202019
Number of
Shares		Weighted Average Fair Value
Number of
Shares
Weighted Average Fair Value
Number of
Shares
Weighted Average Fair Value
(in thousands) (in thousands) (in thousands) 
Unvested shares at January 1697 $5.97 1,480 $7.00 2,717 $7.91 
Granted438 $5.18 584 $2.86 493 $3.06 
Vested(893)$5.81 (1,098)$5.26 (1,516)$7.16 
Forfeited— $8.59 (269)
(1)
$7.79 (214)
(2)
$8.38 
Unvested shares at December 31242 $5.12 697 $5.97 1,480 $7.00 
(1)Includes 171,813 shares forfeited as a result of the reduction in workforce for the year ended December 31, 2020.
(2)Includes 65,196 shares forfeited as a result of the reduction in workforce for the year ended December 31, 2019.
The following table summarizes equity-classified restricted stock unit activity to be paid out in Company stock for the years ended December 31, 2021 and 2020.
20212020
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value
(in thousands)(in thousands)
Unvested Units at January 1134 $3.05 — $— 
Granted— $— 186 $3.05 
Vested(92)$3.05 (42)$3.05 
Forfeited(5)$3.05 (10)$3.05 
Unvested Units at December 3137 $3.05 134 $3.05 
Summary of Equity-Classified Performance Units Activity
The following table summarizes equity-classified performance unit activity to be paid out in Company stock for the years ended December 31, 2021, 2020 and 2019, and provides information for unvested units as of December 31, 2021, 2020 and 2019:
202120202019
Number of
Units (1)
Weighted
Average Fair Value
Number of
Units (1)
Weighted
Average Fair Value
Number of
Units (1)
Weighted
Average Fair Value
(in thousands)(in thousands)(in thousands)
Unvested units at January 1— $— 178 $10.47 598 $10.01 
Granted— $— — $— — $— 
Vested— $— (178)$10.47 (378)$9.59 
Forfeited— $— — 

$— (42)
(2)
$10.47 
Unvested shares at December 31— $— — $— 178 $10.47 
(1)These amounts reflect the number of performance units granted in thousands.  The actual payout of shares ranged from a minimum of zero shares to a maximum of two shares per unit contingent upon TSR.  The performance units had a three-year vesting term and the actual disbursement of shares, if any, was determined during the first quarter following the end of the three-year vesting period.
(2)Included 41,761 units related to the reduction in workforce for the year ended December 31, 2019.
Schedule of Liability-Classified Stock-Based Compensation Costs
The Company recorded the following compensation costs related to liability-classified restricted stock unit grants for the years ended December 31, 2021, 2020 and 2019:
(in millions)202120202019
Restricted stock units – general and administrative expense$12 $5 $7 
Restricted stock units – capitalized expense$8 $2 $5 
The Company recorded the following compensation costs related to liability-classified performance unit grants for the years ended December 31, 2021, 2020 and 2019:
(in millions)202120202019
Liability-classified performance units – general and administrative expense$12 $7 $2 
Liability-classified performance units – capitalized expense$6 $2 $1 
Summary of Liability-Classified Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity to be paid out in cash or Company stock for the years ended December 31, 2021, 2020 and 2019 and provides information for unvested units as of December 31, 2021, 2020 and 2019:
202120202019
Number
of Units		Weighted Average Fair ValueNumber
of Units		Weighted Average Fair ValueNumber
of Units		Weighted Average Fair Value
(in thousands) (in thousands)(in thousands)
Unvested units at January 111,613 $2.67 12,992 $2.42 8,202 $3.41 
Granted1,486 $4.23 6,172 $1.41 8,659 $4.34 
Vested(4,522)$3.40 (3,960)$1.43 (2,624)$4.09 
Forfeited(640)
(1)
$4.56 (3,591)
(2)
$2.67 (1,245)
(3)
$3.48 
Unvested units at December 317,937 $4.08 11,613 $2.67 12,992 $2.42 
(1)Includes 360,253 units related to the reduction in workforce for the year ended December 31, 2021.
(2)Includes 2,010,196 units related to the reduction in workforce for the year ended December 31, 2020.
(3)Includes 400,056 units related to the reduction in workforce for the year ended December 31, 2019.
Summary of Liability-Classified Performance Unit Activity
The following table summarizes liability-classified performance unit activity to be paid out in cash or stock for the years ended December 31, 2021, 2020 and 2019 and provides information for unvested units as of December 31, 2021, 2020 and 2019:
202120202019
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value
(in thousands) (in thousands)(in thousands)
Unvested units at January 18,699 $2.57 5,142 $2.42 2,803 $3.41 
Granted3,580 $4.14 6,172 $1.41 2,757 $4.34 
Vested(2,020)$4.05 — $— (43)$2.42 
Forfeited(744)$3.40 (2,615)
(1)
$3.05 (375)
(2)
$3.12 
Unvested units at December 319,515 $2.88 8,699 $2.57 5,142 $2.42 
(1)Includes 518,450 units related to the reduction in workforce for the year ended December 31, 2020.
(2)Includes 375,086 units related to the reduction in workforce for the year ended December 31, 2019.
Share-based Compensation, Liability-based Restricted Cash Units Nonvested Activity
The following table summarizes performance cash award activity to be paid out in cash for the years ended December 31, 2021 and 2020 and provides information for unvested units as of December 31, 2021 and 2020:
20212020
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value
(in thousands)(in thousands)
Unvested units at January 118,353 $1.00 — $— 
Granted18,546 $1.00 20,044 $1.00 
Vested(4,955)$1.00 (100)$1.00 
Forfeited(3,672)
(1)
$1.00 (1,591)
(2)
$1.00 
Unvested Units at December 3128,272 $1.00 18,353 $1.00 
(1) Includes 1,241,000 units related to the reduction in workforce for the year ended December 31, 2021.
(2) Includes 945,500 units related to the reduction in workforce for the year ended December 31, 2020.